The basics is better than most of us
On your race map, write down the bearings of the route you want to take from all the checkpoints. It saves thinking which way to go.
Do your own nav don't just follow.
If you can find a copy, Mountain Nav for Runners, is good.
Try a Nav course. The FRA do one twice a year or you could try; Nav 4, Everything Outdoors or The Fell Running Guide.
Have fun!